Device for bending metal rods or tubes



DEVICE FOR( BENDING METAL RODS 0R TUBES.

N. REYNOLDS.

APPLICATION FILED MAR` 5.192I.

PatentedSept. 26

1922. 2 SHEETS-SHEET l.

TWMIOJE QA M665 1. N. REYNOLDS. DEVICE FOR BENDING METAL RODS 0R TUBES.APPLICATION FILED MAR. 5, 1921. I Ao Patentedsept. 26, 1922.

2 SHEETS-SHEET 2.

gw/IM" ffozazlffr Patented Sept.. 26, i922.

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laf-h 'JAMES N. REYNOLDS, 0F CLEVELAND, OHIO.

DEVICE FOR BENDING METAL RODS OR TUBES.

Application led March 5, 1921. Serial No. 449,815.

Bending Metal'Rods or Tubes, of which the4 "following is a full, clear,and exact description, reference being had to the accompanyinf:drawings.

My invention relates to a device 'for' bending metal rods or tubes, oneobject' being to provide asimple and eflicient device of this characterwhich shall be made of fewpa'rts 'and'becheap in manufacture. Anotherobject is to providea device which may be readily adjusted to bend rodsof various sizes'an'd on various radii. Other objects of Vtheinvention'will be apparent in the course of the following descriptionyand the features of novelty ,will be pointed out inthe claims.

In the drawings in which a preferred embodiment of my invention isillustrated, Fig. 1 is a plan view. of the device with the upper casingplate 50 removed; Fig. 2 isa frag- `mentary view of a portion ofFig. 1,showing a guide plate having a curved end of `slightly larger diameterthan that shown in Fig. 1; Fig. 3 is a fragmentary section on the line3-3 of Fil. 1; Fig. Ll is a plan view with a portion of the plate 12broken awav to show the underlying mechanism in full 1 lines; Fig. 5 isan end view of the device as yillustrated in Fig. 1 and showing it.attached to a standard; Fig'. 6 is a plan view of the device on asmaller scale and showing the completelyy assembled deviceV of thecasing plat-e in position.

The device in general `comprises a guideway for lguiding a rod and amember movable transversely of the guideway, one guide member having acurved face adapted to form the rod as the'transversely moving memberforces it against the curved end of the guide. Referring morespecifically to the drawings and to the different parts by referencenumerals, the device as illustrated lcomprises a lower plate 10, whichmay be provided with end fiange's 11 by means of which a plate 12 beheld on the first named plate and spaced therefrom. The "device'isadapted to be suitably attached to ,.astandard,' as shown in Fig. 5, bymeans of 'the bolts 15 passing'through suitable openings'in the plate10.

The upper plate 12 has secured thereto a suitable guide means such asthe-slides or guides 20, 21. These members have opposed faces forming` aguideway adapted to direct .a rod or tube of metal and the mem- ;ber 20is provided with a suitable curved end 22. MovableV transversely of theguideway so formed and situated beyond its end is aroll 30, which isadapted when operated to force the rod'in the guideway against theAcurved end 22 of the guide20 as shown in Fig. In the bending of metalrods it is desirable Athat the rod shall be'bent on a radius not lessthan the radius of the rod and the curved face 22 should therefore be ofa radiusat least as lgreat as that of the rod being operatediuoon.` Inorder to adapt the ymachine for bendingrolls of different sizest showthe ,quidemember 2O as readily detachable from the frame. so that it mavbe replaced by a guide 'having a suitably formed curved end.

While it is desirablethat'the radius of curvatureshall be at least asfrreat as that of the rod, the rod may of course be bent on a largerradius, but in order to form a smooth bend the roll should pass close tothe bending ,guide and preferably to arlistance equal to the diameter ofthn rod. ln order that the same `guide member mav be adapted for usewith different sizes of rods itis therefore necessary thatran adjustmentbe provided for moving the `ouide relative to the path of thetransverselv movable memfber and for this purpose Ihave shown the member2O as slidably mounted on the plate 12 and guidedy bymeans ofundercut'flanfres 16 which extend parallel to the guide face of themember .20` and'serve to hold it against lateral shifting.

ln order to provide a positive means for adjusting the member` 2Otowards and from lthe pathrof the roll 30, and for maintainingr .it inadjusted. position l have shown the 'set .screws 17 abutting the edgeofthe rguide 2O and threaded in the flange 18 extendingr transversely ofthe flanges 16 and suitably secured to the plate 12. l prefer also toprovide still further holding; means for the ,Qjuide 20. which is shownherein as consisting of the bolts or screws 19 extending through slotsin theA guide 2O `and threaded invr the plate 12. l

By means of .this adjustment,'the end of the `guide may be^brought intoproper relation with the pathway of the transversely moving roll 80. lnFig. 2 1 have illustrated a guide member 20', which has an end ofslightly larger radius ot curvature than that ot member 20, shown in Fig. 1. This member corresponds in all other respects with member 20.

rllhe guideway tor the rod should snugly lit the rod in order to insurecorrect bending thereof, and therefore means should be provided forvarying the width ot this guideway. l accomplish this result in thedevice illustrated by mounting the guide 21 on the guide 2O so that itmay be moved transversely thereof, and l show suitable means torbringing about this adjustment and for holding the plate in adjustedposition. rllhe means for accomplishing this result consists ofpositioning screws 25 which are threaded through a longitudinal flangecarried by the guide 2O and which screws abut a side of the guide 21. lmay also provide the screws 24 projecting through slots in the guidemember 21 and 'threaded in the guide 2O which screws constitute anadditional means tending to maintain the guide 21 in position on guide20. l also show this guide 21 as abutting the end flange on the guide 2Owhich assists in preventing the disalignment ot the guide member.

lt will be seen, therefore, that the screws 17 and 25, respectively,serve as means to take up the thrust exerted upon the guides 20 and 21,respectively, when the metal rod is being bent by the action ot roll 30,while the screws 19 and the flanges 16 in the case ot guide 20, and thescrews 24 and the end -flange on member 20, in the case ot guide 21,

j also assist in holding the guides in position.

ln order to provide protection for the set screws torpositioning theguide members, l prefer to provide a protecting plate or cas?- ing whichmay be suitably secured to the plate 12 and which has cut away portionsto allow access to the guide members and room "for manipulation ot thehandle 1 -O, as is clearly shown in Fig. 6. Y

ln order to operate the bending roll 30 with the requisite torce ll showthis roll j ournaled at one end in the lever 31 and at its other end inthe angle member 32, which may be suitably secured on the lever. rlhelever 31 is shown as lying between the plates 10 and 12 and to provide apivot Jfor this lever, l have shown a pin 33 having reduced endsextending into the plates 10 and 12 and passingthrough an opening in thelever 31, suitable sleeve bushings 311- being provided to hold the leverin position longitudinally of the pivot member. The roll 30 extendsupwar lly through an arcuate slot 14 in the plate 12, having` the pivotpoint 33 as its center so as to allow the swinging of the roll on thispin as center.

ln order to actuate the lever and roll by a power multiplying mechanism,l have shown the lever as connected by means ot' the link with a lever1-0 pivoted intermediate ot the plates 10 and 12 by means of pin s1 inthe same manner as the lever 31 is mounted. The linlr 85 is connected tothe lever 31 at the point 3G and tothe lever 40 at the point 12, thedistance from 83 to 36 being greater than the distance from 411 to 42,whereby the lever 81 will have a smaller angular motion than the lever410. The outer end of the lever 10 is suitably formed to be grasped bythe hand of the operator.

lt will be seen that l have devised a very simple mechanism which isadapted to quickly and smoothly bend a rod, tube or the like. The deviceconsists of very few parts and adjustable mounting' o12 the guidemembers allows the adjusting whereby the device may operate upon rods ofvarying sizes,

w iile the ease with which these guides may.

be removed and replaced allows the device to be readily adjusted to varythe radius of curvature formed at the bend of the rods.

My device, by providing positive means tortalring up the thrust on theguides which occurs during the bending` operation, insures themaintenance of these members in correct position so as to cause asmoothbend of the article operated upon. y

While have described a specific` embodiment of the invention it will `beunderstood that many changes might be made therein, and that variousotherforms of device might be constructed embodyingl the principles otmy invention, and the forefroing description is to be taken asillustrating a particular embodiment ol' the invention rather thanrestricting the charactery and scope of the invention` `lila-ving tlrusdescribed myl invention, l claim:

1. ln a rod bending machine, a trame .having an upper plate, guidemembers mounted on said plate and itorming a guideway for rods to bebent, there being a slot in said plate adjacent the end oit saidguideway, a pivoted member mounted to move beneath said plate and havinga bending roll extendthrough said. slot, means for moving said bendingroll in the slot to bend a rod held in said guideway, said meansincluding a hand lever pivoted on said trame vand means connecting thehand lever to the pivoted member whereby the lattermay bef actuated.

2. ln a rod bending machine, a base member and an upper plate spacedtherefrom, a member pivoted to the base and the plate, an

operating lever pivoted to the base and theplate adjacent said member, alink connecting said member and the lever, an angle bracket secured tosaid member and having a bearing for a bending roll therein, a bendino'roll fitted in said bearing and havin T its 13o lower portion abuttingsaid member, there being a slot in said plate through which said bendingroll projects.

3. In a rod bending machine, a base member and an upper plate spacedtherefrom, a substantially triangular shaped member pivoted to the baseand the plate, an operating lever pivoted to the base and plate adjacentsaid triangular shaped member, a link connecting said triangular shapedinember and the lever, an angle bracket secured to the triangular shapedmember and having a bearing for a bending roll therein, a bending rollfitted insaid bearing and having its lower portion abutting saidsubstantially triangular shaped member, there being a slot in said platethrough which said bending roll projects and a holding' member formaterial to be bent having an anvil located adjacent said slot, saidanvil being movable toward and from said slot whereby bars of differentsizes may be bent. v

In testimony whereof, I hereunto aiiix my signature.

JAMES N. REYNOLDS.

